Bump Guice version to 4.2.1
Bump Guice version to 4.2.1

This update includes upgrade of ASM dependency to 6.2.1 that is required
for JDK 10 support. Gerrit is already using the right version of ASM
library, but Guice is shading ASM in distribution. There is a feature
request to stop shading ASM in Guice: [1], but it's not easily doable,
because Guice needs to specify ASM version it's using internally.

[1] https://github.com/google/guice/issues/1198
Change-Id: If14990d81ee79c38307b94514fcbb07118f66111

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